Suppose we have two objects sitting on two side of a lever, and the lever also has a mass, and those objects have masses. Then how we can balance $\sum τ$?
This is what I have done:
$$\begin{multline}M_\text{heavier}\times g\times D_\text{from center to heavier} - M_\text{lighter}\times g\times D_\text{from center to lighter} \\ - \text{torque caused by mass of lever}\end{multline}$$
where $D= \text{distance from center}$
I don't know to to include torque cased by mass of lever
